Base | Representation |
---|---|
bin | 111111001101111… |
… | …0100000000000101 |
3 | 12110211110010221110 |
4 | 1332123310000011 |
5 | 13321013020401 |
6 | 550253035233 |
7 | 103365034110 |
oct | 17633640005 |
9 | 5424403843 |
10 | 2121220101 |
11 | 999412070 |
12 | 4b2485b19 |
13 | 27a60a730 |
14 | 161a11577 |
15 | c63599d6 |
hex | 7e6f4005 |
2121220101 has 128 divisors (see below), whose sum is σ = 4133154816. Its totient is φ = 930631680.
The previous prime is 2121220091. The next prime is 2121220133. The reversal of 2121220101 is 1010221212.
It is not a de Polignac number, because 2121220101 - 210 = 2121219077 is a prime.
It is a Curzon number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2121220151) by changing a digit.
It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1888326 + ... + 1889448.
It is an arithmetic number, because the mean of its divisors is an integer number (32290272).
Almost surely, 22121220101 is an apocalyptic number.
2121220101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.
It is an amenable number.
2121220101 is a deficient number, since it is larger than the sum of its proper divisors (2011934715).
2121220101 is a wasteful number, since it uses less digits than its factorization.
2121220101 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1211.
The product of its (nonzero) digits is 16, while the sum is 12.
The square root of 2121220101 is about 46056.7052772992. The cubic root of 2121220101 is about 1284.8780539044.
Adding to 2121220101 its reverse (1010221212), we get a palindrome (3131441313).
It can be divided in two parts, 2121 and 220101, that added together give a palindrome (222222).
The spelling of 2121220101 in words is "two billion, one hundred twenty-one million, two hundred twenty thousand, one hundred one".
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